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. 2015 Oct 1;5:14673. doi: 10.1038/srep14673

Figure 4. Creation of uniform doughnut spots along the optical axis by focusing the eradiated field from the magnetic current tapered line source.

Figure 4

Contours of |E|2 in the r–z plane for (a) N = 5, (b) N = 6, and (c) N = 11. (d) Required pupil field distribution for N = 6 at the normalized pupil plane.